Nut-lock.



R. G. BURTON.

NUT LOCK. ArPLIoA'rxoN HLED pm. 5, 190e.

[NMEA/TOR.

Patented oct.2o,19os.

A 'froze/V514@ v RUFUS G. BURTON, OF BLUEFIELD, WEST VIRGIIA.`

NUT-LOCK.

Specification of Letters Patent. I

Patented Oct. 20, 1908.

Application led December 5, 1906. Serial No. 346,480.

To all whom it may concern: 1

Be it known that I, RUiUs G. BURTON, a citizen of the United States,residing at Bluefield, in the county of Mercer and State of WestVirginia, have invented a new and` useful Nut- Lock, of which thefollowing is a specification.

This invention has relation to nut locks and it consists in the novelconstruction and arrangement of its parts as hereinafter shown anddescribed.

The object of the invention is to provide a nut lock consisting of a nutand bolt and locking key made from soft metal. Before the threads arecut in the bolt the surface of the same is provided with one or morelongi tudinally extending grooves. The thread is then cut inthe boltaboutthe said grooves so that the grooves extend along the bolt for theentire length of the thread thereof. Before the thread is cut in the nutthe inner surface thereof is provided with a groove which extends fromone face and terminates at a point between the opposite faces of then'ut. The thread is then cut in the nut. The key is of soft metal and isadapted to be forced into registering grooves in the nut and bolt. andwhen seated its end is bent up into a radially extending channelprovided upon the outer face of the nut. The nut is then turned backvery slightly and its thread is forced into the soft metal of the key,consequently, it is impossible for the key to slip out of theregistering grooves as it is impaled therein by the thread of the nut.By

I this means a simple and eiective means is provided for retaining thekey without complicating the nut lock or adding unnecessary parts to itsstructure.

In the accompanying drawing Figure 1 is a side elevation of a bolt witha nut in section locked thereon. Fig. 2 is an end elevation of the nut,the bolt and the locking key, showing the position of the parts previous to impaling the key; Fig. 3 is an end elevation of the nut, the boltand the key showing the positions of the parts after the key is impaled.

The bolt l is provided with one or more longitudinally extending grooves2, 2 which are cut in the bolt previous to cutting the thread 3.Bycutting the grooves first a more perfect thread may be produced uponthe surface of the bolt l; if the thread is cut first and the grooveschanneled out afterwards, the tool in channeling the grooves willdistort the thread to a greater or less degree. The nut 4 is providedwith a groove 5 which extends from the outer face thereof to a pointintermediate its inner and outer faces. The outer face of the nut 4 isprovided with a radially extending channel 6 the inner end of whichcommunicates with the outer end of the groove 5. After the groove 5 iscut the interior of the nut 4 is provided with a thread. The key 7 ismade of comparatively soft metal and when the nut 4 is screwed upon thethread of the bolt l and the groove 5 thereof is brought into registerwith one of the grooves 2 of the said bolt the key 7 is drivenlongitudinally in the said grooves and then the outer end of the saidkey is bent up into the channel G and lies Wholly within the perimeterof the nut. The nut is then given a very slight backward turn and thethread thereof enters into the soft metal of the key 7 and impales thesame in the channels receiving' it so that it cannot movelongitudinally.

It is to be observed that the grooves in both nut and bolt arerectangular in cross section and of the same transverse dimensions andconfiguration, and it is further to be observed that the key is of thesame transverse dimensions as the combined dimensions of the groove inthe bolt and nut thread. It will be noted from an examination of Fig. lthat the groove in the bolt extends through the thread into the bodythereof and the groove in the nut like- Wise extends through the threadsinto the body thereof, and it will be observed that by reason of thisthe key will lie partly behind and partly in front of the points of thethread. When the nut is turned slightly backwards, the effect of this isthat the points of the threads on both bolt and nut catch in the sidesof the soft key and prevent its retraction. Thus, means is provided forlocking the nut upon the bolt and also for positively retaining thelocking key between the nut and the bolt. It is further to be observedthat by reason of the groove extending only part way through the nut, anentire thread is left in thevbottom of the nut. In practice it is Wellknown that where even a slight bur is left, or a slight projectionexists on the first thread of the bolt, and a similar projection existsin the first thread of the nut, it is almost imposn sible to start thenut properly on the bolt. It has, also, been found that if there is agood thread on the nut, such as is obtained in the present device, bynot cutting the slot entirely through the nut, the same Will be readilyrun over any projections that may exist on the bolt.

Having described my invention What I claim as ne7 and desire to secureby Letters-Patent is A nut lock comprising a bolt having a grooverectangular in cross. Section extending longitudinally of its thread, anut having a groove rectangular in cross section extending along itsthread from the outer face of the nut to a point intermediate of theinner and outer faces thereof and arranged to leave one or more entirethreads in said nut adjacent the inner face, the said grooves of thebolt and nut being of the same transverse dimensions and coniigurationand the said grooves extending entirely through the threads into thebody of the bolt and nut,y said nut having upon its outer face aradially extending channel which communiinto the radially extendingchannel of the nut whereby the said key lies entirely Within theperimeter of the nut, the transverse dimensions of the key being thesame as the combined transverse dimensions of the groove in the bolt andin the nut thread.

In testimony that I claim the foregoing as my own, I have hereto affixedmy signature in the presence of tWo Witnesses.

RUFUS G. BURTON. INitnesses S. I-I. MELoHoR, WM. M. DOYLE.

